Radiowave receiving device



March 30,1926 1,578,735

v H. F. HUNTER ET AL RADIQWAVE RECEIVING DEVICE Filed May a. 1924 2 Sheets-Sheet 1 winter/g March 30 1926.

H. F. HUNTER ET AL RADIOWAVE RECEIVING DEVICE Filed May a, 1924 2 Sheets-Sheet 2 III'IIIIIII 1/ l /ll l' iolladrvatl Patented Mar. 30, 1926;

UNITED STATES PATENT orries HERBERT F. HUNTER AND LELAND S. HANNOLD, 0F SWEDESBOEO, NEW JERSEY.

RADIOWAVE 'RECEIVIN G DEVICE.

I Application filed May 8,

To all whom it :nuzy concern:

Be it known that we,'l l1-:nmcirr F. l-luNTnn and lnnziinn United States. residing at Swcdcsboro, in the county of Gloucester and State of New Jersey, have invented certain new, and useful Improvements inllzuhowave Receiving Devices, of which the tion. i

This invcntion relates to a radio wave rcccivino-device. and particularly-to a construction adapt ed for use with radio receiving sets of the audion 'liulbtvpe, and is adapted for increasing the rcceptiye capacity of these sets, without the use of an antenna.

An objebt otthe invention resides in providing a device of the character above mentionedwhich is adapted for use to increase following; is a specificathe volume'of a received signal, increase the activity in tuning. and elin'iinatc objectionable noises and static interference.

changes in the construction;

Another object of the invention resides in nroviding; a wave receiving device, for

'use'in connection with the audion bulb type of radio receiving circuit, wherein a )lurality of inductance coils are mountc in axial relation, the coils at one end being connected in parallel with a wariable condenser and having, an electrical connection with a. metallic sleeve, positioned over the central portion of the coil at the opposite'end, in

-order that an inductive relation Will be set up between coils when positioned over the central portion of a; radio receiving set, for receiving, radio wave'signals and inductively transmitting such signals to the receiving circuits of the set,'one side of the condenser and first mentioned inductance coil being provided with a. ground connection for increasing the receptive qualities of the device, without the use of'antennm. and for absorbing and eliminating undesirable noises and static interterencmwhile at the same time,-

increasing the volume and selectivity of si nal reception. v

The invention also comprehends other objects and improvements in the details of construction and arrangement of the 'parts, which. are more particularly pointed out in the following description claims directed to a preferred form 'of jthe invention, it being understood, howeve' hat various nay made,

soo

without departing from the spirit-an of the invention, as described and claimed.

S. .ll-mzvom, citizens of the shown in Figure l.

A substantially 1924. SerialNo. 711,843.

In the drawings, forming a part of this apglication: c i igure 1 is a view of the invention, showmg the casing in section and the remaining portions in elevation. 7

Figure 2 is a sectional line 2-2 of Figure 1'.

Figure 3' is a. transversetaken on the line -3 of Figure 1.

Figure 4 is a longitudinal-sectional view, through one end portion of the device.

Figure 5' is a longitudinal sectional view, similar to Figure 4, taken through the other end portion ofthe device, and Fig. 6 is a (liagranimatical showing of one manner of using the device. r r v i i i The invention includes a casing 1, preferably of elongated tubular fo1m,'closed at its ends by suitable and 2. Avariable plate condenser 3 is mounted view, taken on the sectional view,

which end may be termed the forward end for the pui 'pose ofdistinction, the position of the plates being varied by theusual ad justine' dial 4, i nounted on the shaft of the condenser, which is extended through the forward end plate 2, in' anianner clearly 'A pair of binding posts 5 and 6 respeetively,' are mounted in the casing 1,. at diametrically opposite points, adjacent the forward cnd'thereof, and are each electrically connected with the opposite terminals out the condenser, the i binding post, 5 being ,conneeted with the in tor or movable plate, whilethe binding est: 6 .is connected with the stationary p ate.

in the casing'l, in concentric-relationthere n, and 1s preferabiy constructed of suitable insnlatlng material, for receiving lildllGlJEliIlCB,

coils s and e respectively, the can seei a ,i

provided. with a substantially"largeknu i of'windings, while thecoil 9 has-rel few. windings. v tube 10, of slightly, er diameter than th tube 7 is inoimt' tween the end oft stubs-1 and'gth a -b e condenser 3, in concentric relatioltwith the tubular casing '1', one end of "the-tube -10 projecting into the tube-7, i-n amannen" as clearly illustrated in the drain/ind] ":lh' tube 10 is provided witira coil winding,"

dica-ted at 11, extending substantially thee tire length thereof, and havin a, rel atively large number of turns, the en vloorticnis"of the coil being electrically connected a ta plates indicated at 1' elongat tube m t g-1 mm has neon found by experiments,

opposite terminal of the variable coi'idenscr. This is etiected through the wire connection 12, from the end ot the coil adjacent said condenser with the stationary plates t-hcrcof. while the wire connection 13 extends from the movable 'platefi of illfilt'tflltltllh'tl through the central portion 6? he coil .to the opposite end of the winding, as indio-allia l at 14. A'sleeve l5 preterablyot copper. positioned, on the coil 8, iii'i'ernicdiatc the ends thereof, and extends over substantially one-third of the windings ot' the coill'aud is electrically connected by a wire lti. with the coil 11, at the point- 14. at one end thcreol. A split sleeve member 17 preferably formed of copper, is positioned over one end portion of the coil 8, and the adjacent end portionof the coil (hand is provided with an electrical connection indicated at 18, for the binding post 19. mounted on the casing l, in the central portion thereof. 'lhe'cnd o t the coil 8, at. the rear end of the casing l, is connected with the binding post 20 at the rear end of the casing, in order that the, coil 8 may be connected in circuit to an antenna as will be explained.

The three coil windings 8, t), and l l. in being arranged in axial relation, provide l'or relative inductance between the coils,- while the copper sleeves and wiring ctmnections in the casing, provides for the lion; of energy through the" coils, and the sleeve, particularly the signal energy which it is desired to receive. 'lhe coil 9 is notelectrically connected with any other element, and is interposedbetween the coils 8 and ll lor preventingstray :iorccs from atlecting the inductive action trtnn between the coils and preventing interference with the inductive cooperation ot said coil.

The use of the device is indicated in Fig ure 6, wherein 2tiudicates an autlion bulb type of receiving set, having acrial and round contacts at 22, and in which the ,tulpes ot' the several stages of al'iiplilication are usually arranged, in alignment length- ;isc'o'l' the set. The device may be placed directly on top of the set 2t as indicated by dash lines, in Figure (3, at Q lhin which case the teri'ninal (i, is provided with a wire connection to a suitable ground,- and by properly tuning the crmdcnser 3, wavc signals will be received in the several iutluctanccs, and indu tively transmitted to the circuit of the receiving circuit. .21 l'or properly receiving and amplification.

In the use of the device in this manner, it,

that substantially weak signals can he received and amplified without local or static interference, and at the same time materially reducin the use of an aerial. The received signa 3 may be louder and clearer in the reproducing device of the receiving set with the use of the present invention than when and that the recept the same is connected with an aerial and ground, in the usual and well known manner.

If desired, a vario coupler 25 may be used in connection with the set. 21, by having the rotor windings connected to the aerial and ground terminals by suitable wires 26, while the stator ol' the vario coupler is connected by wires :27 to the binding posts 71 and 19 respectively. oi the wave receiving device. in the casing 1, while the binding post (i is conucctcd with the ground by a wire 28. aml binding port it) is connected with an antenna :39 as indicated. In this use of the device. the operation of the vario coupler 25 and the condenser 3 is etl'ected, for tuuiut: the dctector circuit, in connection with the tuning; devices in the set, in receiving a sinnal, while undesirable interferences are absorbed in the device, by transmi, sion in the several inductance coi s and carried through to the ground, and the signal impressed in the proper circuitfor transmission to the rcceiving sot 21.

In the use of this device, it will be seen that an aerial is not. absolutely necessary,

ion of signals may be eflectcd by the inductive cooperation of the invention with the receiving set, or by direct transmission thereto. in both cases, the result being'iucreascd volume, and couacquently range of reception, together with exceedingly tine selectivity.

it will be apparent. from the l'orec'oinadescription, that a simple and convenient form ot device has been provided, for use in conjunction with radio sets to! cli'ectine an increased selectivity of the set, iucrcasct receptive range, and increased volume in the rcccivcd signals, and at the same time eliminating the use of an antenna.

What is claimed is:

l. A device of the class describet'l. comprising a casing, a plurality of inductance coils mounted in axial relation therein. a va riable condenser mounted in one end of the, casing, in line with said coils and electrically connected in parallel with the adjacent. coil. binding posts on the casing, a pair of connections extending from opposite terminals of the condenser and connected coil to a pair of binding posts, and a circuit connection between the first mentioned coil, and the coil at: the opposite end, and a metallic sleeve mounted on the'coil at the opposite end of said casing, whereby said coils may he arranged in inductive relation with a radio receiving set i'or having circuit connections therewith to increase the signal receiving qualities of said set.

2. A device of the class described including a tubular casing, a variable oordenser mounted atone end to said casing. and a plurality of inductance coils mounted in axial relatlon in said casing, adjacent said eonllt) Inn

'40 tioned coils an "55 tion,'and a variab denser, the coil adjacent said condenser having its ends connected to the terminals of the condenser, circ'ui't connections being provided for connecting one terminal of the condenser=and coil with the ground, and a connection-loeing provided with the other terminals of the condenser and coil, and a metallic sleeve mounted on the inductance coil, at the'opposite end of the casing, an interl mediate coil, and the end coil'having the metallic sleeve thereover, having their-ends terminating in adjachnt relation, a metallic sleeve being positioned over saidadjacent end for permitting atransmission of ener between said coils, the first mentioned coll having a second binding post connection on the casing, 'and the last lmentionedf sleeve having a 'binding' post connection on said casing adapted for electrical connection I w1th-the radio receiving set, for cooperation therewith, to increase the volume of signal w'eception. v

t 3. A device of the character described in- 1 cluding a tubular cas ing having a condenser mounted in the forward end thereoff having electrical connection With a pair 0 ing posts mounted on the cas ng, axplurahty ofinductance coils mountedm' axial rela tion insaid tube/the coil adjacent said con- 0 denser having the terminals connected to the' said condenser, the coil atthe rear end of the casing havin a relatively large number otrwindings an connected at the rear end I to a binding p'ost carriedb ,the casing, a

metallic sleeve'mo nt edkin t e central rtion of'the coil, at he rear end of the casing having electrical-connections with one on of said condenser, and first mentioned coil, the coil windin intermediate said first-men? mounted in the central portion of the casing terminating ad'acentjth'e ends of. said coils, a split met lie sleeve;

member mounted over one end of the centralcoil and the adjacent and ofj-thecoil' at the rear of the casing, and electrically connected with the binding' post on sand casingiv whereby said coils cooperate with the meta sleeves and, .con'densentfor receiving and in ducing or transmitting radlo-s'i ale to the receiving set and increase the v0 ume, range,

and selectivity of said set. Y i 4. A, device of the class described, comprising a plurality of inductance -coils mounted inaxially aligned inductive relae condenserconnected in parallel with one of the inductance coils and having an inductive connection with another of said inductance coils spaced from the first mentioned inductance coil, one terminal of bind- I minal1capacitatively connected to other of the condenser and connected inductance coil '9 and one terminal of the second mentioned inductance coil forming terminals of an" inf-fl ductivcly coupled primary circuit, the other terminal of the condenser and connected coiland an inductive connection with the second mentioned inductance'coil and an adjacent-- inductance coil formmg'an inductively cou plcd secondary circuit inductively arrange with the primary circuit. 4

5. A device of'the classdescribed coin-17 ,prisiug a plurality of inductance fcoils 'l 1 tion with the coil at the opposite'end'jof the" plurality of inductance co1ls",'a wire con: ncction with one terminal of the'condenser and the member, and a member inductively arranged with the lastmentioned inductancefl coil-and an adjacent'coil, one terminal of the condenser and one end of the secondmentioned inductance coil forming terminals for connection in a primarych'cuit, a ter minal with -the second inentionedxmemberfi and-the other condenser terinin'al'for con nection to a secondary circuit, 4

6; A device of the class described com prising a plurality'of axially aligned inde-'- pendent inductance coils arranged in he 0'- tive relation without electrical 'connectio a variable condenser electrically connected {in parallelv with one ofsaid coils, all "of said coilsand the-condenser adapted to be included in an inductively couled' circuit, and a secondary circuithaving one terminalelectricall connected -to the c011,? and connective con enser, and the-other ter- H said inductive. coils i 7. A device o'f'the'lass described including' a primary circuit "including a plurality: of axially alignedlindependent inductance coils, without electrical connection and inductively .associated,, a variable capacity 1 having the terminals electrically connected to one of 'saidcoils, a capacity connection with one terminalofjthe-last mentioned coil and'capacity, and another inductance coil,

and a secondary circuit having an electrical 11c connection'with the first mentloned capacity coil, and a capacity connection with other of said coils? v In testimony whereof we aflixi our signatures.

u HERBERT F. HUNTER.

LELAND s. HANNQPD. 

